HOW TO KNOW THE SEAWEEDS 



26a Thallus more or less corticated, but ultimate branchlets either 

 strictly uniseriate or corticated only by bands. Fig. 43 27 





kC3/ 



o 





Figure 43 



Fig. 43. Examples of small portions of three different Ceramium spe- 

 cies, (A. X 250; B-C. X 100) to show various kinds of cortical 

 bands encircling the relatively very large cells of the uniseriate 

 axes. 



26b Ultimate branchlets neither uniseriate nor incompletely corticated 

 by cortical bands, but completely corticated and (or) with many 

 rows or layers of cells 32 



27a Ultimate branchlets uniseriate but with cortical bands 



28 



27b Ultimate branchlets strictly uniseriate, without cortical bands ... 29 



46 



